Quarter	Percent
1999-01-01	7.7
1999-04-01	11.7
1999-07-01	11.1
1999-10-01	11
2000-01-01	14
2000-04-01	14.2
2000-07-01	13
2000-10-01	12.6
2001-01-01	12.2
2001-04-01	12.2
2001-07-01	12.6
2001-10-01	13.1
2002-01-01	15.9
2002-04-01	16.5
2002-07-01	15.4
2002-10-01	14.5
2003-01-01	16.8
2003-04-01	13.5
2003-07-01	13.4
2003-10-01	15
2004-01-01	16.6
2004-04-01	16.4
2004-07-01	14.9
2004-10-01	14.6
2005-01-01	15.1
2005-04-01	13.2
2005-07-01	12.3
2005-10-01	12.5
2006-01-01	11.9
2006-04-01	10.6
2006-07-01	8.6
2006-10-01	8.5
2007-01-01	8.5
2007-04-01	7.9
2007-07-01	7.8
2007-10-01	7.1
2008-01-01	6.7
2008-04-01	6.4
2008-07-01	4.4
2008-10-01	4.2
2009-01-01	5.2
2009-04-01	5.4
2009-07-01	6.3
2009-10-01	8.6
2010-01-01	9.2
2010-04-01	9.2
2010-07-01	9.1
2010-10-01	10.8
2011-01-01	10.9
2011-04-01	10.8
2011-07-01	9.9
2011-10-01	11.2
2012-01-01	11.3
2012-04-01	10.4
2012-07-01	11
2012-10-01	11.2
2013-01-01	10
2013-04-01	11
2013-07-01	10.3
2013-10-01	10.9
2014-01-01	12.4
2014-04-01	9.8
2014-07-01	8.0
2014-10-01	8.7
2015-01-01	8.6
2015-04-01	7.9
2015-07-01	7.8
2015-10-01	8.5
2016-01-01	8.3
2016-04-01	9.9
2016-07-01	7.6
2016-10-01	7.6
2017-01-01	6.5
2017-04-01	6.4
2017-07-01	5.0
2017-10-01	4.8
2018-01-01	4.2
2018-04-01	4.8